A key outcome of the 1783 Treaty of Paris was the establishment of American territorial boundaries that extended significantly beyond the original thirteen colonies. This treaty defined the United States' borders to include areas east of the Mississippi River and north to the Great Lakes. It laid the groundwork for westward expansion and settlement, helping to solidify the idea of Manifest Destiny. The newfound territory also presented challenges as it involved interactions with Indigenous peoples and neighboring nations. This expansion prompted debates over slavery and governance, influencing U.S. political dynamics for decades to come.